brankston



(No Model.)

STON TRUNNION BEARING PQR ORDNANGE, @te

R. T1 BRAM Patented Fe linien@ Armar RALPH T. lBlANhSTOX, OF lLSWlCK YORKS, l'lilWUAS'ILEUPON-TEXIS, FNGLAND, ASSIGNOR TO \V. (l. llUUlS'lllOXtfl. lll'ftlll'lllll CO., (LUI-y ITEDQ OF SAME PLACE.

TRUNNlON-BEARENG FOR OREIJNANCEV, lec.

SPECIFICATION forming part of Letters Fatemi No. 378,282, dated February v223., 1838.

Application tiled June 1,1313?. Serial No, 23.",913. (Xo lnodrl.) lalenlrnl in l'laly lhteininjr Ill, 153i". No .ll

To LZZ 111710711/ it muy concern.'

Be it `Known that l, larrn Vlunw .BiminisToN, a subject ofthe Queen of Great Britain, residing at Elswick Works, Newcaslleupon- Tyne, England, engi-neer, have invented cer tain new and useful lmpro.'ements in 'lruunien-Bearings for Ordnance and other H eavy Mechanism, (for which l have received Letters Patent in Italy, N 20,888, dated December' 31, 1886,) of which the following is a specilication.

The improvements relate to means for reducing l'riction at the bearings of gun-trunnions to facilitate the turning of the gun on such trunnions, while at the same time keeping the trunnions solidly supported, asherctofore, in bearings of large dimensions, and able to withstand t-he pressure brought upon them when the gun is fired. Like arrangements are applicable in mounting the axes or trunnions of other mechanism which at times has to support heavy loads or strains, but which at other times it is desirable to he able to turn readily. To dothis I, in addition to providing the gun or mechanism with trunnions capable of supporting a heavy strain, also provide other or auxiliary bearings adapted only for supporting the weight of the gun or mechanism itself, and not the load or strain, these additional hearings being made to take the greater part of the weight of the gun or mechanism, and to be so formed that the trunnions turn in or upon them with but little friction. The drawings annexed show ways in which this may be effected.

Figures' l and 2 are vertical sect'ons of trun nion1bearings for a gun in which the subsidiary oradditional bearing is formed by a rock ing lever held by a spring against the Linder side of the' trnnnion. Figs. 3 andft are vertical sections of a modification in which each trunnion has a trunnion of small diameter projecting from its end and is supported in a bearing sastained by a spring. Figs. 5 and 6 are vertical sect-ions cfa modiiicat-ion in which the small trunnions projecting from the main trunnions rest on the top ofthe circumference of a frictioirwheel. Figs. 7 and 8 are vertical sections of a modification in which a tial; sur

face on the under side of a projection from the end of the trunnion rests on a knife-edge. Figs. 9 and lt) are `vertical sections ofa modi- Iieation in which a projection from the end et' the trunnion is formed into a lini'ecdge to rest on a bearing held up to it by a spring.,

ln Figs. l and 2, A A are the main trunnions of a gun, resting in the main or ordinary j truunion-bearings, l, forlningpart Aof a gun carriage or mounting, provided with compressorcylinders lB, and formed at C to slide upon two lmrallelbarsorsurlaces, in'the ordinary manner. A recess is made at the bottom of the main bearing at l), and in this recess the small rocking pillar E of the auxiliary bearing is lmlged. The lower end of the rocking pillar is rounded to a small radius, and rests in a recess formed to receive it on the top of aspringhar, F. rIhis bar at one end rests upon a fixed support, G, and at its other end on a screw, il, which passes through a lug on the gun-carriage. ily turning.;` this screw the rocking pillar is pressed upward until it supports the greater part of the weight'of the gun. The upper end ofthe pillar is curved to aradius nearly equal to the length of the pillar, so that between it and the trunnion there is only rolling friction. 'lhe movement ot the foot of the pillar in its bearing is very slight,

sothat the power required to turn the gun is' Very slight.

1i the modification shown at`F'igs v3 and 4,

A A are the main trunuions of the gun, sun-v portedin trunnion-bearings B. ll Hare small auxiliary truunions projecting from the ends of the trunnions A. These are received into bearing-bloeksl, which are lodged inguides provided to receive them at the ends of the main bearings. l l( are springs. beneathtlie auxiliarybearing-blocltsl. 'lhcsespringsare of sufficient strength to almost but not quite lift thc gun by the auxiliary trunnions.

In the modification shown at Figs@ and 6 the small auxiliary trnnnions J' are made to rest upon the periphery of wheels L, the axes l 95.

L of which rest in cavities" in springbars F, which, as in Figs. ,l and 2, can hepressed up-v ward. by screws ll.

In the inoditication shown at Figs. 7 and 8,

bei 'of the trunnion.

spring F is supported at its two ends, and is adjustable either by a screw, H, as before, o1' by introducingilling-pieees beneath it.' The adjustment is so mede that the spring-bers take almost the entire weight of the fun.

In the moieetion shown ab Figs. i and i() the knife-edge bearing is on the under side of the projection from the end of the main trunnion, and it ress in a, groove or recess in the eprng-bzn` lF.

Having new particularly described and ascertained. the nature of my seid invention and in what manner the seme is to he performed, I (leelare that what claim if@ The combination of the trunuions, the bearings or annular Supports surrounding the trunnions, andthe auxiliary springsusmined Supports exerting upward pressure on the trunnions, and hexeby relieving the bearings er annulm'supporls from weight, substantially :is set; forth.

'11. T. BRE-JEKSTON.

.Vilnesses:

T. Unvs, WM. JOHN GREY,

Notary Public. 

